<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .div1{
            width: 100px;
            height: 100px;
            float: left;
            background-color: black;
        }
        .div2{
            width: 200px;
            height: 200px;
            background-color: green;
            opacity: 0.6;
            overflow: hidden;
        }
    </style>
</head>
<body>
    <div class="div1"></div>
    123
    <span>456</span>
    <div class="div2"></div>
</body>
</html>